<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form>
    <input type="text"value="默认输入的内容">
    <input type="color">
    <input type="password">
    <input type="button"value="注册">
    <input type="text"placeholder="用户名"maxlength="5">


</form>

<form>
    用户名：&nbsp;&nbsp;&nbsp;<input type="text"placeholder="用户名不能超过10位字" maxlength="10">
    <br>
    密&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;码：&nbsp;&nbsp;<input type="text"placeholder="请输入密码">
    <br>
    确认密码：<input type="text"placeholder="请确认密码">
    <br>
    <input type="button"value="注册">
    <br>
    <input type="submit">
    <input type="number">

    <label for="boy">男：</label>
   <input id="boy" type="radio"name="sex">
    <label for="girl">女：</label>
   <input id="girl" type="radio"name="sex">

    <input type="checkbox">


    <select>
        <option>河北</option>
        <option value="">上海</option>
        <option selected>广州</option>
        <option>北京</option>
    </select>

    <!--boolean-->
</form>
     <input type="text"placeholder="请输入手机号">
     <br>
     <input type="text"placeholder="请输入验证码">
     <input type="button"value="获取验证码">
      <br>
     <input type="button"value="登录">
      <a href="">登录</a>

     <br>
<h5>专业</h5>
<select>
    <option>数学</option>
    <option>语文</option>
    <option>英语</option>
    <option>化学</option>
</select>

<h5>性别</h5>
<form>
    <label for="boy">男：</label>
    <input id="boy" type="radio"name="sex">
    <label for="girl">女：</label>
    <input id="girl" type="radio"name="sex">
</form>
<h5>选修课程</h5>
<form>
    <input type="checkbox">数学
    <label for="shuxue">数学</label>
    <input id="shuxue"type="checkbox">
    <input type="checkbox">语文
    <label for="yu">语文</label>
    <input id="yu"type="checkbox">
</form>


<textarea cols="30" rows="10"></textarea>


</body>
</html>